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Note 8 - Fair Value - FairValue Of Financial Instruments Amortised Cost - Instruments Carried At Cost - Liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Measurement Of Liabilities Line Items      
Liabilities € 636,736 € 676,428 € 694,573
Financial liabilities at Amortized Cost [Member] | Level 1 Of Fair Value Hierarchy [Member]      
Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 0
Financial liabilities at Amortized Cost [Member] | Level 2 Of Fair Value Hierarchy [Member]      
Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 0
Financial liabilities at Amortized Cost [Member] | Level 3 Of Fair Value Hierarchy [Member]      
Fair Value Measurement Of Liabilities Line Items      
Liabilities € 544,604 € 594,190 € 613,247